OUR BOAT IS IN A MARINA THE NEW UNIT HAS US ON LAND IN THE MIDDLE OF THE MARINA AT GREAT BAY MARINA WHEN IN FACT WE ARE IN THE WATER AT THE DOCK ABOUT 150 TO 200 HUNDRES YARDS AWAY
Upgrading the system software of your GPSMAP 545s will increase its accuracy. Instructions for downloading and installing the update are here.
I hope that helps.
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